adding in improvements from when we ran the birthday party app. Mostly fixed the Dockerfiles so they use Alpine for the base images. That required re-working the Java worker Docker file. Removed links from compose file. cleaned up a few things like a tab instead of a space in app.py

voting-app/Dockerfile

@@ -1,5 +1,5 @@
 # Using official python runtime base image
-FROM python:2.7
+FROM python:2.7-alpine
 
 # Set the application directory
 WORKDIR /app
@@ -11,8 +11,8 @@ RUN pip install -r requirements.txt
 # Copy our code from the current folder to /app inside the container
 ADD . /app
 
-# Make port 5000 available for links and/or publish
-EXPOSE 80 
+# Make port 80 available for links and/or publish
+EXPOSE 80
 
 # Define our command to be run when launching the container
 CMD ["python", "app.py"]

voting-app/app.py

@@ -36,9 +36,10 @@ def hello():
         hostname=hostname,
         vote=vote,
     ))
+    resp.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0, max-age=0';
     resp.set_cookie('voter_id', voter_id)
     return resp
 
 
 if __name__ == "__main__":
-	app.run(host='0.0.0.0', port=80, debug=True)
+    app.run(host='0.0.0.0', port=80, debug=True)